Best available copy



Jan. 29 1924.

W. G. H. FINCH RECORDER FOR RADIOTELEGRAPH OUTFITS Filed Dec. 9. 1921 Patented Jan. 29, 1924.

UNITED ISVTATE s PA NT; OFFICE.

WILLIAM GEORGE HAll/OLD FINCH, OF JERSEY CITY, NEW JERSEY.

RECORDER I TOR RADIOTELEGRAPH OUTFITS.

Application tiled December 9, 1921. Serial No. 521,148.

'-invented certain newand useful Improvements in Recorders for Radiotelegraph (Jutlits; and 1 dohereby declare the following to he a full, clear, and exact description of the invention," such as will enable others skilledinthe art towhich it appertains to make'nnd use the sanie,reference being hail to the accompanying'dravviiigs, and to'the letters and'figures of-re ference-marked thereon, which form a pan of this specification.

Thisinventionrelates to recorders for radio-telegraph outfits and has for an object t'o'provide an apparatus to'be' applied to a and ordinar type which will provide in;-

proved means for recording by the use of an I ordinary: ta we. rcgistetj'theflradio message receivcdat't 1e station.

-A further" object of the invention IS to provideinea'nsfor employing the vibrations of the .diaph'ragm of a receiver correspond ing" approximately'to the telephone-receiver i of anordinaryradioreceiving outfit, which said vibrationsare. converted into electrical impulses v for actuating printing reco rder of any usual an: "o'rt'l'ina'ryitype,

A"'-fuir ther object of.v.=the inveiition 'is to--' provide improved m eansfor' enlarging and augmenting the vibrati'ons of the diaphragm of the receiver-tocontrol tliemake aud break .contactmechanism which, in turn, controls and actuates the printing recorder.

With 'theseand other objects in view the .invention comprises certain novel units,

elements, parts, combinations, arrangements, inter-actions, functions and principles, as disclosed in the drawing, tbgetherw'ith me; 'chanical and electrical equivalents"thereof, will 'be her eina'lt'eli more fullydes'gr'ibel and claimed, a a

In the drawings y Figure 1 is a perspective view of the apparatus employed in the present recording outfit;

Figure nisrn;

Figu e 3 is a fragmentary view of a modified type of adjustin'g structure, and s Figure 4 is a diagrammatic view of a tuner and two-stageamplifier radio circuit with a diagrammatic view of the present in- Q is 'a top plan view of the mecha- 7 l2 aroconnect'ed with bindin ventioniand a recording printer associated therewith.

Like characters o'frcference indicate corrcspoudu'u; parts throughout the several VIEWS.

, stantially with tlie o'rdinary telephone reradio installation o'fsubstanti-ally the'usual ceiver -of a '-radio-|.'6(eiving station, except that t has'been found desirable in most cases to wind the receiver to present greater 'the usual and ordinary type. I

This receiver 15 is carried upon a base 18 which is referahl of insulating, material and a bloc or auxiliary base 19 is mounted thereon, spaced away from the receiver 15. Upon this auxiliary base .19 bearings '20' and 21 are mounted, preferably with what are ordinaril known asjewel hearings such as areernploycd in horological devices with :1 staff 22 mounted in saidiieziringsv 'lho. bearings 20 and 21 are carried in any ap proved manner, as by mounting one in the plate 23 and the other upon a screw 24 which is :uljustalile through the top plate 25 and with a nulrlcd lock nutQ'O for maintaining the adjustment of. the. hearing 21. This staff 22 carries :1 lever 27 having a short arm 28"to which the diapl'u'agm I7 is connected by means of a rod preferah ly composed of" This is accomplished by mounting upon the base l8 .the guide-ways 31 with a block 32 rigidly secured to the receiver 15 and a screw 33 inserted throu h the members 31 into the block 32 for a 'ustment. Such screw is refcrably provi ed with a nurled head 34 i or convenience of manipulation.

Spaced from the block 19 an upright 35 is mounted having contact screws 36 and 36 having their extremities or contacting ends spaced apart, as indicated at Figures 1 and 2 and capable of adjustment by rotat ing such screws in the usual well-known manner to increase or decrease the interval between the contact extremities. The lever 27 is provided with a contact member 37 proportioned and positioned to engage against the screws 36 or 36' as the lever 27 may be swung in one or the 'other direction. Electrically connected with the upright 35 and consequently with the contact screws 36 and 36' ls a binding post 38 and a second binding post 39 is electrically connectedwith the lever 27. This connection with the lever 27 is referably by means of a, wire 40, connecte to the plate 25 at 41, to which the bindin ost Is also electrically connected throu i te wire indicated in dotted lines at 42 in igure 2. This wire 40, while not absolutely essential to the o' e'ration of the deice carries the current rom the plates23 and 25 instead of carrying such current through the needle points of the staff 22. When jewel'bearings are'employed for journaling the staff 22 such jewels form in fact insulation, that such wire is necessary, but in cases where metallic bearings are substituted for the jewel bearings, the wire is Still desirable as it prevents the electro lytie action of the current upon the moving parts of the bearing.

-- equally to positive and na ative impulses the diaphragm 17. In ndi'mal position thet engthenm The two contactscrewsjlfi and 36' are employed to adapt the device-for responding contact 37 is spaced substantially equally between the contact screws 36 and 36.

\Vhen positive impulses are received at the with the screw 36. When, however, negative impulses .are received and the diaphragm 17 vibrates underfihe negative impulses, theoontact 37 will swing into contact with the screw 36 and so long as. negative impulses only are received the movement Wlll be from normal to engagement with the screw 36. It is obvious, therefore, that the device will make contact with the i structure supported by the upright 35 un- To employ the vibrations of the arm 27 which is moved b the diaphragm 17 as above described, a coal circuit is employed connectecbwith the binding posts 38 and 39. Preferably, though not necessarily, this is a relay circuit as indicated at Fi 'ure 4, such relay being indicated at 43 wit an armature 441 This armature 44 in its make and .break under the impulse of the relay 43, will close a local circuit from the batter 45 to the armature 44 at 46 and contact 4 to a tape register 48, of the usual and ordinary type. Preferably the relay circuit is rovided with a condenser 49 and a manual switch 5 1). This arrangement is desirable so that the relay circuit may carry a very low voltage current as indicated by the battery i short vibrat-ion of the lever 27. It is to be' understood, of course, that a connection f rpm the binding posts 38 and 39 ordinarily 18 as immaterial to the present inventionas the radio circuit indicated as awhole at 10, but the showing of thecircuits is considered desirable under the present practise and while the invention is in no we limited thereto, will be found desirable a juucts to the 'present invention.

In operationin an initial installation the device will be adjusted so thatthe contact 37 is disposed equidistant between the ex tremities of thescrews 36 and 36. This adjustment is accomplished by manipulating the turn-buckle 30' or by the use of the referred structure which comprises the guideway 31 and bloclr32 with screw 33. The movement of the diaphragm to which the (X1529 are attached, or the shortening or of the rod, accomplishes the purpose 0 swingin the lever 27 upon its staff 22 to aocomp ish the desired adjust- 'ment. Conditions remaining the same further adjustment will be unne'ccsse 1' but further adjustment is made possible to meet working conditions which may be atmos pheric or otherwise. Adjusted as shown at igure 2, the vibration of the diaphragm 17 will cause a longitudinal movement of the rod 29, which, being att ched to the short arm 28, will vibrate the extremity of the lever 27 through a sufiicient are to make and break the circuit at thecontact 37 with the screws 36 or 36 depending upon the direction of the currentas hereinbefore described. The closing of the local circuit 1) this contact will operate a device describe preferably a. tape. register and preferably through the medium of the relay circuit, as disclosed. although -it is obvious that this relay circuit is not absolutely essential to the operation of the device.

Wherever throughout this specifi ation and claims tape register" or other recording mechanism is mentioned, it is to be understood that it is only by way of illustration and not by way of limitation of the invention, and that the invention is applicable to a great variety of uses among which may be mentioned radio control, but with no intent. to limit it even in such manner.

What I claim is: l. The combination with a magnetically vibrated diaphragm, of a bell crank lever journaled adjacent the diaphragm, a rigid connection between the vibrating diaphragm and the short arm of the bell crank lever, a 16 contact positioned to engage the longer arm of the bell crank lever, and electrical connections between the lever and the contact 2. The combination with a viln'atinc diaphrz m, of a jonrnaled stafi' spaced from 20 the diaphragm. a hell crank lever carried rigidly by the. stafl and having'legs of an 'eqnal lengtln. a rigid connection between the shorter leg of the bell crank lever and the diaphragm, a contact spaced from the stall. a contact extremity carried by the longer leg' of the lever in position to engage the contact when vibrated by the dia phragm. and electrical connections between the longer arm of the lever and the contact. 3. The combination with a diaphragm mounted to vibrate differently under impulses of opposite polarity. a bell crank lever journaled in spaced relation to the diaphragm a rigid connection between the diaphragm and one leg of the bell crank lever, spaced contacts upon opposite sides of the other leg of the bell crank lever positioned to engage the extremity of said lever when swung in either direction, and electrical connect-ions between the spaced contacts and the lever.

4. The combination with an electrically vibrated diaphragm ot' a bell crank lever fnlrrnnicd in spaced relation with the diaphragm and having le; of ditl'erent lengths, a connecting rod extending from the vibrat in; diaphragm to the shorter leg of the bell rank lever. spaced contacts mounted in spaced relation to the fulcruming of the lever and presenting contact extremities in position to be engaged by the extremity of the longer le of the lever. and means to vary the connection of the diaphragm t0 the shorter lt'fJ of the lever to adjust the relation of the longer leg'of the lever between said spared contact points.

in testimony whereof l hereunto atlix my signature.

WlLLlAM GEORGE HAROLD FINCP 

